<!DOCTYPE html>
<html lang="zh-cn">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>JS001-Hello!JS</title>
</head>

<body>
  <p>这行文字是HTML文档中原有的内容，下面是JS动态追加的内容。</p>
  <!-- 内部JS -->
  <script src="JS001-Hello.js"></script>
</body>

</html>